PC Gameplay - when you run your compatible game, XSplit Gamecaster will automatically hook into it. Once it hooks, you will see a notification in your game that tells you the hotkey for accessing the HUD. The default hotkey is [Ctrl] + [Tab]. Once you press the hotkey, it will activate the XSplit Gamecaster HUD:

If you have already connected one of the supported capture cards then navigate to the Start tab of the XSplit Gamecaster window and click on the button labeled OPEN CONSOLE VIEWER to show your console game: